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'Keep your cool' during emergency alert test, government says

Tens of millions of UK phones on 4G and 5G networks simultaneously emitted a 10-second siren and vibration in a nationwide emergency alert test conducted by government planners.

  • On September 7, millions of mobile phones in the UK emitted a siren sound as part of a national emergency alert test.
  • The alert paused England's cricket match against South Africa and delayed a rugby league match kickoff.
  • This test is the second of its kind, following one in 2023, and aims to prepare the public for emergencies.
  • The emergency alert system has issued real warnings five times in two years, including alerts during Storm Eowyn and due to an unexploded WWII bomb.
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Sirens blare from mobile phones in test of national emergency alert system

At 3pm on Sunday, mobiles connected to 4G and 5G networks vibrated and sounded for around 10 seconds.

·London, United Kingdom
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Chronicle Live broke the news in Newcastle upon Tyne, United Kingdom on Friday, September 5, 2025.
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